本文中要介绍以下几种实体，了解它们的工作方式，以及如何在我们自己的XML文档中利用它们的优势。
In this article, you look at several kinds of entities, and learn how they work, and how to take advantage of them in your own XML documents.
本文中要介绍以下几种实体，了解它们的工作方式，以及如何在我们自己的XML文档中利用它们的优势。
In this article, you look at several kinds of entities, and learn how they work, and how to take advantage of them in your own XML documents.
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